Presentation: receiver property

If the code is running in a context which is receiving a presentation, the returned value is a PresentationReceiver which can then be used to communicate with the context which is the source of the presentation.

If the current context is not receiving a presentation, receiver is null.

You can easily determine whether or not the context is the receiver for a presentation by checking the value of navigator.receiver. If it's a non-null value, then the context is indeed receiving a presentation. If it's null, there's no incoming presentation.

footer.textContent = navigator.receiver ? "Receiving presentation" : "(idle)";

This example uses receiver to access the list of incoming connections and to build and display a list of those connections' ID strings.

let listElem = document.getElementById("connectionview");

navigator.presentation.receiver.connectionList.then((connections) => {
  connections.forEach((aConnection) => {
    listElem.innerHTML += `<li>${aConnection.id}</li>`;
  });
});

After getting access to the output list element in the variable connectionView, navigator.receiver is used to get a reference to the PresentationReceiver object for this context, and its connectionList is used to get a Promise which will be called when the list is available.

The promise handler receives as its input parameter an array of the incoming connections. We iterate over these using forEach(), appending a new item to the connectionView list element for each connection.

• Presentation API
• Presentation
• PresentationReceiver